add Q-A tag

Author: ChenYilong

Diff for: CYLTabBarController/CYLPlusButton.m

@@ -66,5 +66,4 @@ + (void)addSelectViewControllerTarget:(UIButton<CYLPlusButtonSubclassing> *)plus
     [plusButton addTarget:plusButton action:@selector(plusChildViewControllerButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
 }
 
-
 @end

Diff for: README.md

@@ -5,6 +5,7 @@
 ![enter image description here](https://img.shields.io/badge/pod-v1.6.0-brightgreen.svg)
 ![enter image description here](https://img.shields.io/badge/Swift-compatible-orange.svg)   ![enter image description here](https://img.shields.io/badge/platform-iOS%207.0%2B-ff69b5297537064.svg) 
 <a href="https://github.com/ChenYilong/CYLTabBarController/blob/master/LICENSE"><img src="https://img.shields.io/badge/license-MIT-green.svg?style=flat"></a>
+[![Codewake](https://www.codewake.com/badges/ask_question.svg)](https://www.codewake.com/p/cyltabbarcontroller)
 </a>
 
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